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LMR12007 Dataheets PDF



Part Number LMR12007
Manufacturers Texas Instruments
Logo Texas Instruments
Description Step-Down DC-DC Regulator
Datasheet LMR12007 DatasheetLMR12007 Datasheet (PDF)

LMR12007 www.ti.com SNVS982 – SEPTEMBER 2013 LMR12007 Thin SOT23 750mA Load Step-Down DC-DC Regulator Check for Samples: LMR12007 FEATURES 1 •23 Thin SOT-6 Package • 3.0V to 18V Input Voltage Range • 1.25V to 16V Output Voltage Range • 750mA Output Current • 550kHz (LMR12007Y) and 1.6MHz (LMR12007X) Switching Frequencies • 350mΩ NMOS Switch • 30nA Shutdown Current • 1.25V, 2% Internal Voltage Reference • Internal Soft-Start • Current-Mode, PWM Operation • WEBENCH® Online Design Tool • Therma.

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LMR12007 www.ti.com SNVS982 – SEPTEMBER 2013 LMR12007 Thin SOT23 750mA Load Step-Down DC-DC Regulator Check for Samples: LMR12007 FEATURES 1 •23 Thin SOT-6 Package • 3.0V to 18V Input Voltage Range • 1.25V to 16V Output Voltage Range • 750mA Output Current • 550kHz (LMR12007Y) and 1.6MHz (LMR12007X) Switching Frequencies • 350mΩ NMOS Switch • 30nA Shutdown Current • 1.25V, 2% Internal Voltage Reference • Internal Soft-Start • Current-Mode, PWM Operation • WEBENCH® Online Design Tool • Thermal Shutdown APPLICATIONS • Local Point of Load Regulation • Core Power in HDDs • Set-Top Boxes • Battery Powered Devices • USB Powered Devices • DSL Modems • Notebook Computers DESCRIPTION The LMR12007 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6pin Thin SOT package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components and online design support through WEBENCH®, the LMR12007 is easy to use. The ability to drive 750mA loads with an internal 350mΩ NMOS switch using state-of-theart 0.5µm BiCMOS technology results in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 18V input operating range down to the minimum output voltage of 1.25V. Switching frequency is internally set to 550kHz (LMR12007Y) or 1.6MHz (LMR12007X), allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LMR12007 utilizes current-mode control and internal compensation to provide highperformance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection. Typical Application Circuit Efficiency vs Load Current "X" VIN = 5V, VOUT = 3.3V VIN C1 ON OFF D2 VIN BOOST C3 SW D1 EN FB GND L1 VOUT C2 R1 R2 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. WEBENCH is a registered trademark of Texas Instruments. 2 All other trademarks are the property of their respective owners. 3 PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2013, Texas Instruments Incorporated LMR12007 SNVS982 – SEPTEMBER 2013 Connection Diagram www.ti.com BOOST 1 GND 2 FB 3 6 SW 5 VIN 4 EN 1 6 2 5 3 4 Figure 1. 6-Lead SOT See Package Number DDC (R-PDSO-G6) Figure 2. Pin 1 Indentification PIN DESCRIPTIONS Pin Name Function 1 BOOST Boost voltage that drives the internal NMOS control switch. A bootstrap capacitor is connected between the BOOST and SW pins. 2 GND Signal and Power ground pin. Place the bottom resistor of the feedback network as close as possible to this pin for accurate regulation. 3 FB Feedback pin. Connect FB to the external resistor divider to set output voltage. 4 EN Enable control input. Logic high enables operation. Do not allow this pin to float or be greater than VIN + 0.3V. 5 VIN Input supply voltage. Connect a bypass capacitor to this pin. 6 SW Output switch. Connects to the inductor, catch diode, and bootstrap capacitor. These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings(1) VIN SW Voltage Boost Voltage Boost to SW Voltage FB Voltage EN Voltage Junction Temperature ESD Susceptibility(2) Storage Temp. Range Soldering Information Infrared/Convection Reflow (15sec) Wave Soldering Lead Temp. (10sec) -0.5V to 22V -0.5V to 22V -0.5V to 28V -0.5V to 6.0V -0.5V to 3.0V -0.5V to (VIN + 0.3V) 150°C 2kV -65°C to 150°C 220°C 260°C (1) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications. (2) Human body model, 1.5kΩ in series with 100pF. 2 Submit Documentation Feedback Product Folder Links: LMR12007 Copyright © 2013, Texas Instruments Incorporated LMR12007 www.ti.com SNVS982 – SEPTEMBER 2013 Operating Ratings(1) VIN SW Voltage 3V to 18V -0.5V to 18V Boost Voltage -0.5V to 23V Boost to SW Voltage 1.6V to 5.5V Junction Temperature Range Thermal Resistance.


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